Okay, I fully blame @imagines-forthe-soul for this… but, just imagine Sero together with Inko.
Bell inserted the headcanon that Sero would tots be the friend that has sex with his friend’s single mother’s, and I know Inko isn’t technically single, but c’mon… now the idea won’t leave me alone.
Sero is totally that friend that fucks his friend’s single parents. He in no way means it in a disrespectful way but if Jenny’s mom has it going on and she’s I retested in him… sorry but she’s getting dicked down.
Inko probably came to the dorms once to see Izuku and Sero had to do a double take cuz “wow, this dime is Izuku’s mother? I have to introduce myself.” And he did, he chatted her up real nice and she said he was awfully cute and flirtatious for such a young man and he promptly showed her that this young man knows a lot of big man moves.
Neither he or Inko have said anything about it to Izuku and I don’t think they ever will until a few years latter the fact.
And don’t get me wrong, Sero isn’t a cunt afterwards either. He still fully respects Izuku and Inko and actually sends gifts for her often for good graces. Tbh, Izuku is always question why Sero is always sending gifts home for his mother but he never really pushes the matter.
Also… Denki totally knows what’s going on cuz he actually caught Sero once with someone else mom. He’s a little jealous of Sero but he never really says much about it, just sits in the background and snickers cuz Sero is such a hoe.