Todoroki Shouto and Izuku Midoriya happily married after graduating high school and getting jobs as Pro Heroes.

However,their marriage rapidly turned astray.

It was a toxic household by now. Todoroki got advance of Izuku and lost the sheer respect for his 'husband'. He'd also guilt trip and manipulate him.

It got to the point where Izuku was done. So,he left after another argument and stumbled upon a bar.

And he accidentaly got drunk together with his childhood frenemy, Katsuki Bakugou.

They ended up having a night stand.

It was unprotected because they got lost in the moment. And now, 2 months later, Izuku fears he's bearing Katsuki's pup.