why in anime do not healthy girls always grope healthy girls out of envy?
because they're jealous
because they are envious
Because they are all secretly lesbians.
Explains why in harem anime the main male character is soo damn girly.
Because anime is superior to real life.
Because this is fanservice
Measuring each other.
Also, helps them grow bigger, and it comes to a point where they're a bother to hold up.
lessons I learned from umisho: squeezing tits makes them bigger.
boob massage makes them grow bigger, obviously.