Trying to find a BL series.

I've been trying to find this BL series for the past 2 days. I remember watching a series that, one of them was dared to go after the other person. I'm not sure if it was the main couple plot or the support character's couple plot. I could be mixing it up with a non-BL series, but I could've sworn I watched a BL series with that in it. 

If you know it, or if I might be crazy, please let me know! <3