My girlfriend and I(M) have been experimenting a lot and found that part of the fun is trying new things or developing new things from stuff we found we like. We found we particularly like femdom in general, as she really enjoys being in charge and the control it gives her. We've tried a good amount of stuff but we're looking for more ideas. Some stuff we tried and decided we're into are:
-anal play/pegging
-bondage
-sensory deprivation like blindfolds
-roleplay
-crossdressing and sissyfication
-chastity
-using a strapon in general
-edging
-mutual masturbation
-she loves being overstimulted
Our hard limits are extreme things like knife play, gun play (obviously), blood play, public sex, threesomes, exhibitionism, otherwise we're pretty open
We're really just looking for new things to try and experiment with
Any suggestions are greatly appreciated