It wasnt that bad literally, relatively speaking to other third party chars in bl stories. All three of them have a promiscuous lifestyle which all of them were equally aware and comfortable of. Takane was socially smart and fast on the uptake which is why what he did more like helped these two, edging them to realize their feelings for each other.
i’m not speaking relatively tho that doesn’t matter at all. and it’s fine if they’re all promiscuous it doesn’t matter. but the stunt takane pulled was so unnecessary and was just straight up gross and invasive of their relationship, they took advantage of that to have their sexual fun. they did not need the “help”.

idc, i hope that disgusting bitch gets his ass beat