The Liar's Trap

I have a steady live-in boyfriend. His name is Tatsuma.

But lately Tatsuma has been cold. He always comes home late and eats his meals out....... I was wondering if this is because I'm not good at sex and I can't satisfy Tatsuma. I was doubting myself and feeling lonely.

One day, I went to a drinking party at Makishima-kun's house, who was our friend in college. Tatsuma didn't come because he had something to do at work. Trying to have a good time, I drank a bit more alcohol than usual, and I talked a bit too much. I even complained a little about Tatsuma… but everyone listened and laughed it off as a joke. Makishima-kun was the only one who took my problems seriously. After everyone had fallen asleep, he thoughtfully listened to me and Tatsuma's sexless problem without making fun of me.

"I like both of you and Tatsuma, so I want you to stay with each other. It would be sad if you break up because of that, even though you are a good match for each other."

He offers to help me "practice feeling arousal" so I could become a better lover, but—

(Source: DLSite, translated)