( I got this from a comment above please everyone should read , he did not CHEAT )These are some spoilers just so readers won't be too put off or have war flashbacks from other yaoi mangas *cough* Anti PT *cough*. And coz I liked how in love the uke is in this one.
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Just to clear in regards to the claim of 'cheating'.
No actual 'impaling' was involved. The situation was that the uke lost his memories of the seme due to some ring that the silver haired chick antagonist gave him.
Conflict rose between the couple because the uke doesn't remember the seme. And when the black haired coworker was getting too chummy with the uke, the seme got jealous. And the couple fought resulting in the seme almost forcing himself into the uke but got ahold of himself before it got worse. But the uke ended up being terrified of the seme.
At some point when the seme was picking up the uke at his work, he saw from his angle what looked like the black haired coworker kissing the uke. He got mad, punched the other guy and in the middle of their fight acidentally pushed the uke to the ground. Uke ran away from the seme.
While the seme was distracted, the black haired coworker went after the uke and offered him a place to stay at his home. Night went on and while the uke was weeping in bed and vulnerable, black haired coworker took advantage of his misery and kissed him. It ended with them briefly making out until the uke passed out crying.
Eventually, the seme FINALLY confronted and dealt the silver haired chick antagonist and got the uke's memories back. The two got back to their honeymoon period. And the uke rejecting the black haired coworker and the other dude by the looks of his face finally giving up.
SPOILER WARNING (⌒▽⌒)
the uke cheats on the seme