Cool idea Tango,  here's some ideas. although I have to admit  obedience isn't  quite my thing...   maybe  it will inspire   
 
1.  Open mouth for cum shot  looking adoringly at Master / Mistress
2   Feel breasts  / pinch nipples  on command
3   Rubs own clit / wanks on command. 
4.  Kiss Masters / Mistress  hand