While this OVA series shows no sexual intercourse or full nipple/vagina exposure, there are lots of gags involving close-ups on panties and large breasts. We sometimes see the outlines of females' nipples through their swimsuits.
A few breast groping gags.
A girl who calls herself a boy's sister (they're not related by blood) repeatedly tries to seduce him, including forcing his hands between her breasts and grinding against his crotch.
Lots of gags involving phallic imagery, such as bananas. Girls are seen taking bananas in their mouths in ways suggestive of oral sex.
One gag involving ramen looking like semen.
Lots of talk about breasts and voyeurism.
