My Carnivorous Young Lovers Are Eating Me Up

Misuzu Kanno, who was dumped by her boyfriend of five years is sexually frustrated, so looks for new encounters on dating apps. There she talks with a college gymnast, eight years her junior, and decides to meet. When she arrives at the rendezvous point, she finds that the boy she was talking with has brought a friend... Misuzu's disappointed at first, until a sweet proposal that the three of them hang out shakes things up!

(Source: MangaPlaza)