Izuku x Momo x Ochako? x Harem?

Realizing her Quirk is nowhere near its potential limit, Momo Yaoyorozu enlists the help of Mei Hatsume, who creates a device that multiplies her calories gained by 25, which in turns multiplies her fat levels gained by 25, and increases her strength proportionately.

(Ex: 3500 Calories = 1 Pound
Average woman needs 2000 calories to maintain weight.

2000×25=50,000 Calories=14 Pounds
50,000×25=1,250,000 Calories=357 Pounds

Essentially, with this device activated, Momo will gain 357 pounds a day on 2000 calories.)

As Momo trains her expanding body, she enlists the help of Izuku, with a romance soon blossoming between them, with Izuku confessing he likes bigger girls.

As they continue dating, and Momo getting bigger and bigger, Izuku's secret admirers go to Mei for help to get his attention.

Knowing Mei,(and me) she creates a device that basically increases the lust/sex drive of those affected, as well as giving them a copy of the gaining device.

Oh boy.