Might want to tell us what platforms you, I mean your friend is playing on.

Gravity Rush 1 and 2. A pair of open world games where you play as a superheroine with power over gravity. She's cute, and there are a number of costumes you can acquire and dress her up in. Because she spends a lot of her time in the air, this means you can see her skirt flapping around (if she's wearing one), and you should know what that means. Especially when one of her costumes is that of 2B, who wears a thong leotard under her dress.

Bloodstained: Ritual of the Night. Spiritual successor to Castlevania where you play as a sexy huntress. She can acquire an ability that allows her to shapeshift into a demon that looks suspiciously like a Playboy bunny, and is broken as hell.

Monster Hunter World and Rise. Make a female characters as sexy as you want her to be, then dress her up in any number of potentially revealing suits of armor. Though it might be worth waiting for Monster Hunter: Frontier Wilds instead, which is coming out in a couple of months.

Resident Evil 2 and 3 Remake. Claire and Jill are as hot as always, there are plenty of attractive costumes to get for them, and even sexier ones to mod in if you're on PC.

Tormented Souls. Survival-horror game designed as something of a successor to the original Resident Evil games. You play as a woman who dresses like a biker chick.

Lollipop Chainsaw. You're a chainsaw-wielding cheerleader cutting a bloody swath through zombies wrecking havoc through the town. If the midriff-baring uniform doesn't do it for you, then maybe the other skimpier costumes you can unlock will.