Waterside Night is this trope done correctly. It’s literally perfect and is exactly what you’re looking for. Added bonus is that the seme’s arc is actually good.
Other stories that might suit your taste where the seme suffers and regrets what they did to the uke:
Walk on Water
Limited run
Mobius strip
Love me doctor
Hit on by a kinky guy (seme is actually pathetic lmao)
My perverted stalker (another pathetic seme)
Royal Servant
Love Sick Dog
Mr 100% perfect (both couples but mostly the second couple)
Painter of the night (not on mgg)
Palace of Bardo (king was a psycho that tortured the Uke. They’re both reincarnated. But Uke remembers everything. Idk if he cries and begs but the king learning…not to torture? Is a big part of the story iirc)
That’s all I can think of rn
Someone give me recommendations like this the angst is so good I love when they regret and cry and the bottom makes them cry and worry it’s just my fave I need more ヽ(`Д´)ノ