For a cuck piece, this one's pretty good. Saeko was stolen by Hajime's boss, but came crawling back after he dumped for an overseas transfer. Hajime accepted her back: he's always been into NTR and wanted to enjoy being a cuck in that situation. After some time, he initializes sex with Saeko, and inwardly comments on all of her changes due to the boss training her. It's Hajime's commentary on Saeko's changes during sex that make this fun for me.
Eh weird, the Netorare is actually backstory context. She cheated on her husband as backstory, she got dumped, he found out and she is asking for forgiveness, luckily for her her hubby just realized he is a cuck so the pages in the work are all about the cuckold of a husband enjoying what his wife learned from someone else and liking what he is feeling, odd situation where the netorare work in question doesn't actually have it happening right now.