2c-b + MDMA would probably be a mindblowingly hedonistic combo....
I have only tried 2c-b by itself though and i find it to be a fucking wonderful substance in its own right.... You would have an amazing night on just 2c-b if you did not want to roll at all...
The experience is generally described as a mixture of LSD and MDMA while not being entirely like either. The visuals are morphing morose than fractals as far as OEV are concerned. CEVs have a fractal nature to them, but overall the visuals are exceptionally colorful and pretty... Mentally is where this drug shines. It has the friendliness and lovey dovey nature MDMA has, and for me i consider it to do a better job at it... You feel social and inconspicuous, its a drug you feel like you could easily be around people on. Its sexual in nature, Shulgin considered it to be an amazing aphrodisiac, and it has far less of the vascular constriction of MDMA so sex is still very much possible. 2c-b has a very interesting nature of being able to be pretty much turned off at common dosages.... The drug is one of the most purely hedonistic psychedelics i have tried, every part of the experience is enjoyable. I think i prefer it over MDMA because i get all of the friendliness out of it minus the negative effects of it like jaw clenching and loss of appetite. Its one of the softest psychs i have tried, oral or plugged doses seem to be preferred over nasal... I have railed 10mg of 2c-b before and its comparable to being punched in the nose for about 20 minutes... It hurts, when they say "legendarily painful" they mean it. The trip comes on hard and fast and just seems more harsh than other methods of ingestion which offer you a little more time to acclimate.
Do try to eat food on 2c-b, its one of the few psychs that give me munchies in a way... Food taste amazing.
as far as 2c drugs and MDMA go my experience is limited to 2c-i and 2c-e... 2c-i + MDMA is amazing but not a rave combination, save it for a nice day laid out next to a pool in a comfortable chair or on the beach with some good music playing... because if you react like me, do not expect to stand for about 5 hours.... you will lay down and trip face with no urge to get up.
2c-e with MDMA i dosed the MDMA later on into the experience because i had a feeling it would floor me, and it kind of did but it was easier on me.... 2c-e is a novel psych, less visual and more mental. The most notable thing about this experience was the intense desire to find someone to cuddle with... like overwhelming desire.....