Cold-Blooded Beast
I was scammed. There was only one double dicking scene with the past self T - T Plot leaves much to be desired because it dragged on and the ending felt abrupt. Like half of the story is smut which wouldn't have been a problem if they didn't promote the double dick so much, but the repetitive sex scenes got boring (I'm still very sad that modern Chaeul never got fucked with both dicks).
Hadakeru Kaibutsu
The Promise
Loved Jing Ye and An Nuo and the relationship between Dr. X and An Nuo, but the ending felt rushed. Unless you read Song of Reverberation, you wouldn't understand the lore of this world and even then the lore in SoR wasn't explicit. This story had a lot of potential and probably should've lasted 80-100 chapters like SoR to have been fully fleshed out, but alas, it is only 41 chapters. It was slightly disappointing.
Hinadori wa Shiokaze ni Madoromu
Summoning a BL Fan to Another World