
I swear her boobs got bigger

Please tell me you're joking. This is anime / hentai logic foolishness. Ones breast are made of fat and tissue not muscles so "giving them a workout" would do nothing to make them bigger or smaller. I once came across a small group of girls who apparently tried constantly massaging their chests in hopes of it boosting development because they heard the same as you from some show they watched when they where young or some rumor and of course they found that to be total bull. I only ever "grope" my chest when showering, yet I'm literally an I cup. It's because of genetics (and weight gain honestly got heavy during quarantine and the weight kept plus I don't work out so it ain't about to go nowhere either obviously ). The thing that decides how you're chest grows (or doesn't) is genetics and all you can do is work out or get work done. And the only reason working out makes any difference in the appearance of ones breast is because of the muscle underneath them. Exercise would only Very Very mildly affect the appearance of ones chest, and as far as I know of (depending on the type and amount of exercise you do) it would only help give a little lift or make them a little smaller but that's it (as far as things I've seen/heard go).

Just to be clear I'm not trying to come at you or anything, but I couldn't tell if you were serious and so I just wanted to make things clear because that "rumor" was absolutely ridiculous to me, but finding out that there were girls naive and gullible enough to fall victim to it made me a little upset due to the potential harm such an idea might cause. So, to all girls out there that didn't already know if you ever hear such a thing don't waste your time and energy it's nonsense.
I’m not really interested in this couple but it was cute I want to see Dan :/