Okay, so here it goes!

I was reading a web comic a few years ago, with a male lead. He was either a Prince, a king, or an emperor. His new wife firmly believed that she had been isekaied as a villainess (he just seemed to find that entertaining). It was on the ecchi side. The wife was either a red head or blonde, and I THINK the male lead had brownish-blonde hair (though I don’t remember exactly).

It was officially licensed, and while I could be wrong about this next part, I think the publisher also published a story that was about a male model getting it on and being in a relationship with his childhood friend. They were both still in high school (can’t remember this ones name either).

I’m sorry, but this is all I can remember. I really hope I can find it! Please, and thank you!

"Wife is villainess, husband finds this entertaining" might be An Observation Log of My Fiancée Who Calls Herself a Villainess, but I don't remember anything remotely ecchi in it.

(Future) wife is redhead, prince is blonde, so that part matches at least. It is officially licensed.

I love this series, but this is sadly not it. Thanks anyway!