Lemon genre: conventional, giantess (no vore), monster sorta with Ben being becoming an alien.
Universe; between Ultimate Alien and Omniverse.
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Outside of Area Fifty something, we see Ginormica Aka Susan Murphy walking around in her full giant size. Recently she's been thinking about her love life remembering her Ex. Derek. And tried to remember why she even liked him.

"I'm regretting some life choices I've made in the past" she muttered, a voice next to her then spoke "same huh?" Startled, she turned to see base's new resident Ben 10 sitting on the large rock pillar next to her. "Oh hey Ben, didn't know you were there" she admitted, a few weeks ago there was a sighting of many unknown monsters down in Modesto. Turns out those were all Ben, he was sent to this world after fighting with Vilgax when his home town had been burned to the ground.

And to vent out his anger and frustration from the event Ben used Rath to deal a lot of damage at a currently empty picnic sight after dark. Thank god no one was there, after that little accident he used the Omnitrix to stop several crimes before team monster found him. They asked him the basic questions such as how was he able to do what he does and he answered honestly saying he had nothing more to lose.

After which General monger had allowed him to fight alongside Team Monster, and the team had taken a liking to Ben. Link enjoyed pulling pranks on people with Ben while also having someone to spot him while working out. Dr. Cockroach enjoyed working with Ben in his intellectual forms building unique and powerful inventions, along with enjoying some casual high class conversation with Brainstorm. B.O.B. liked Ben's sense of humor, then again what doesn't B.O.B. Like?

Insectosautus enjoyed being around Ben's giant form Way Big with Link translating saying he liked having a friend who was he same size as him. Along with his bug like aliens Stink Fly, Big Chill, Crash Hopper, And Ballweevil saying the big insect also liked having another bug for a friend.

Then there was Susan, she liked Ben for the hero he used to be and still is, always helping people regardless of reward or punishment. And he wasn't a bad dude to casually hang out with either, he even volunteered to help make her a bracelet that could return her to her normal size at will. Which turned out pretty good.

"So... nice night out here right?" She asked him, Ben nodded in reply "so, what were you doing out here?" He asked her. Susan lsat next to the rock pillar, "just thinking, you know my ex fiancé Derek?" Susan asked him. He nodded, "yeah, you said he was a selfish jerk who cared only for himself and decided not to marry you because you would've overshadowed his career. That's just stupid" Ben said. "I was thinking, why did I like him in the first place? And started to regret the life choices I made before that" Susan said.

"Yeah well... you're not the only one, I decided to take one month off being a super hero to spend more time with Julie. But after one week of no problems Vilgax reappears and..." his breath caught in his throat at the reminder. She gently raised her hand to him and placed a gentle finger on his back in sympathy, "we heard you talking in your sleep. You really did love her" Susan said, Ben allowed some of his tears to fall in response.

"I don't know why it is that the worst things that can happen to us always relate to the people we love" he said. The giantess agreed with him, and low and behold she had an attraction to Ben, it started about last week when the two had been patrolling the area they were talking to each other. He two had shared a few stories with one another and she started to see Ben as a true friend having an understanding of what she went through after becoming her new self. And over time that friendship she had with Ben started to grow into pure attraction.

"I know you'll never love anyone the same you did Julie, but you have to remember to stay strong. For her" Susan had said, he faced her and nodded, then was taken off guard when the large female had placed her lips on the side of his head and kissed him on the cheeks. After realizing what she had done she immediately retracted her head and looked away in shame.

"S-Sorry..." she apologized, "uh... Susan... why did you kiss..." Ben stuttered, "sorry Ben... you see... I... I sorta..." She was then taken aback when he too repeated her action and gave her a kiss to the cheek. "I... I like you also" he said, "I think it started last week... you know when we went on patrol" he explained.

They both sat there blushing, then Susan spoke "so... do you want to go out sometime?" She asked. He smiled "that actually sounds really nice", Ben was about to jump on her shoulder when he slipped... oh Ben you sly dog 😏.

He fell out off her shoulder and had landed in her shirt, right inside her rack, which was nicely stacked by the way. "Ben?! Eep?!?!" Ginormica squealed feeling the shapeshifter wriggling around her body, "Sorry Susan, I didn't mean to!" He tried to yell. Only for it to come out as a muffled scream, he tried to find a way out and had accidentally passed by a few very sensitive areas. He he, and finally found his way out of her pant leg, "oh my god I am so sorry that happened Susan" Ben apologized. As for the giantess, she was heavily breathing due to him moving around in her clothes.

"Susan are you okay..." he didn't have time to get a reply when she suddenly picked him up and kissed him on the face. "Trying to get me before the first date" she said in a playful tone, "oh what a naughty boy" Ben blushed from that. "I'd say to give that little fella a test run" she said referring to the protuding rod between Ben's legs, she put him down and pressed the bracelet on her left wrist. She began to shrink down to his height, "and I'm be the one to test it" she said before suddenly taking off her uniform. Minus the bracelet which was the thing keeping her small, "Susan what's up with you?!" Ben asked as she pinned him down, "you crawled around inside my uniform... and touched my special places. Thanks to the radiation in my system my sense of touch is amplified to the point where any small movement can be felt..." she said.

Then had pulled his pants down and forced his shirt off, "and now I can't stop myself" Susan then pulled off Ben's boxers and let his friend show its face. "I take back what I said, this little fella isn't little at all" she said seductively as she began to gently squeeze it making the male arch his back backwards. She then took off her own panties and lowered herself on his cock... (currently drooling and is whacked in the head again).

"Oh god it feels so good!" Susan moaned as it entered her vag, "god Susan, you feel... feel..." in that moment Ben's mind fell victim to his hormones. "So awesome" after his rod finally reached her hymen one thrust was all it took to claim her. "AAHHHHHH?!?!?!" She then fell forward onto Ben and began kissing him to which he eagerly to kissed back. After an hour of thrusting he came making both cry out in ecstasy.

"Sorry about that by the way" he said, "don't worry it was my fault to begin with" Susan replied. Ben then looked around "you don't think anyone saw us did they?" He asked, "nope they don't have cameras over here, some sort of dead zone" she replied. Then pointed to a random rock pillar, as they made their way over to it Ben noticed the rock formation smelled... funny yet familiar. "Yeah when I need to... get my frustrations out... I do it here" she said making the boy blush.

Then looked to his pants and saw the large rod that was previously inside her stand high again, smirking she wrapped her arms around Ben again. "well we'll, eager again are we?" She asked slyly, only to get a reply in the form of Ben capturing her lips and making out with her again. "Your enhanced pheromones are getting to me... this is your fault" he said in a seductive manner. "Why don't we try his differently?" She asked before growing back to her giant size, then Ben turned into Humungosaur and grew to nearly match her height. "About to be done by a dinosaur? I winder how many people get to say that happened to them?" Ben joked "shut up and do me!" Susan said before kissing Humungosaur, the alien dinosaur then groped her chest and butt. Ben used his tail to poke her anus making her yelp in surprise, "a tail come in handy" he teased before kissing Susan again. Not even allowing her a breath, she gagged when he tried to stick his tongue in her mouth then groaned as something poked her mid section.

As it turns out Humungosaur was more like a reptile or bird, as instead of a cock he had... whatever reptiles have going on down there. Can't be a Cloaca because that's only found on females as far as I know. Don't know what was going on now but Susan screamed as something started to flow into her pussy...

Okay reptile sex is just weird...
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Later on we now go to Ben and Susan walking back to Area Fifty something holding hands. Hopefully no one figures out where they went all night because they felt awkward enough as it is.