First Time

This is vanilla cheating.
For being just a few years older than the MC, Mayu falls into the Onee-san AND a the milf categories!

-reading the comments people are over thinking it too much. This is some lighthearted cheating between two people who known each other for a long time plus he's always loved her. It's not like they're gonna end up together or something, it's just mutual sex that ends with her encouraging him to find a nice girlfriend but has still only has eyes for Mayu. It's supposed to be bittersweet.
(Some people cant open up lol.)

WHERE'S MY FUCKING SEQUEL?!

Readies chair with righteous intent

Yeah. I know I’m supposed to think it’s bittersweet. But she’s so groomy. Like bro, you do NOT need that level of manipulation in your life!

Not gonna lie, I don't really get the warm 'n' fuzzy feeling from this. Shouta comes off as blindingly naive(especially on page 8) and since we don't know why Mayu and her husband had a big fight, this just feels like she's using him for some stress relief.

"GAWD DAYUM!"

Sexy Onee-san (Mayu-san) got married and (naturally) evolved to Ara-Ara M.I.L.F. level.

Bittersweet level for MC (Shouta) is Definitely Off The Charts!