NTR Netsuzou Trap Vol 5

NTR: Netsuzou Trap by Naoko Kodama. A Yuri manga rated Older Teen, published in English by Seven Seas.

Yuma has just gotten her first boyfriend and turns to her childhood friend Hotaru for advice. Hotaru, who has a boyfriend of her own, starts teaching Yuma in ways that go far beyond friendship, in a tense, steamy yuri drama.