A message popup after a decline option was chosen would smooth things over and keep it playful.
If a partner chicken's out, being playful, and not scorning is key. A customizable field might be good to enter something like...
"Awww, you chickend out this time, maybe you should adjust your profile to BAWK BAWK!!!"
"Aww baby, its OK, I hope you find your lost backbone soon"
"I hope you have a good reason like lack of money for declining <sn>, now you must negotiate an alternate activity for 1 minute that is agreeable, or go straight to jail"
What do you think?