Soredemo Ashita mo Kareshi ga Ii

Kouhei and Mako are a couple in love. However, Kouhei is worried because Mako is very unwilling when it comes to having sex with him. On one such day, he hears a proposal from Mako: how about partner swapping sex with another couple? [Official Japanese](https://yanmaga.jp/comics/%E3%81%9D%E3%82%8C%E3%81%A7%E3%82%82%E6%98%8E%E6%97%A5%E3%82%82%E5%BD%BC%E6%B0%8F%E3%81%8C%E3%81%84%E3%81%84)