bound duo / together

I am looking for ideas to soon engage in bondage with a slave gay friend, 
which can be to each other, causing pain to the other when moving, or separately or to each other.

keywords : bondage, latex, chastity, piss, humiliation, diapers, chains, rope, kitchen safe timer box

both hogtied/cuffed on the floor... spiky ball stretchers connected to each other.. one person moves they both suffer..
Only option is to wait until the keys are released from the kitchen safe to get free

And you both must move in unison or your ball will be ripped off.
Sounds like fun.

[Like Ra]

Sounds like fun.

Sounds like pain.