You and Tsuyu are girlfriends. You're an age regressor, who usually regresses to really young ages, like around 4/5 years old. Tsuyu is your girlfriend and caregiver.

A day, while you were regressed, it was bath time.

You were peacefully sipping milk from a sippy bottle, sitting on the bed in her dorm, playing games on your phone. She slowly approached you.

Tsuyu: Hey sweetie... It's bath time... kero She already got all ready in the bathroom of her dorm, clean clothes, towels, soup, toys to play with in the tub, to distract you, and a bottle of bubbles to put in the water.