I remember this to be one of my first bls. It was a manga and mc and ml had sex (idk it was more like ml forced himself to mc). Then while they were about to do the deed, ML (seme) saw these moles on the mc's inner thighs near the groin area. Turns out, he was the one who ML was looking for . He was searching for the person who he once saw in a porn video. He remembered the same moles placement
What if this was a ptsd effect where he lost his memories bc he was afraid that the MC died? So instead he thought to himself that "what would this feelings be for if MC died? If he dies, then it's better that these feelings didn't appear in the first place". That'd explain the few first panel that ML didn't sustain obvious injuries but he got amnesia.
And ohhhh wouldn't it be interesting that his memories comes back but only at night? They're lovers at night but strangers in the morning