TBH if just starting out on roleplay IMO bondage stuff isn't that easy to introduce into role play situations. If you tthink about it there isn't that many situations that involve tieing up . There is kidnap and intruder situation roleplays but I don't recommend these type for beginners and often lead to rougher style sex which really can be playing with fire unless you are in a long standing relationship and know your boundaries well . Thats just my view.
If amongst your collection of bondage stuff you have a pair of handcuffs then you could opt for things like being arrested for speeding, narcotics ( plant some talcom powder in foil on your partner) .
One of you could also be handcuffed to a chair whilst the other does a strip tease dance.
If you havn't already got a dom and submissive relationship then as a roleplay one of you could be the dom(inatrix) and the other the sub and follow all the commands.
I wouldn't woory to much about laughing at each other thats all part of the fun making sex in the bedroom fun instead of being serious . Whats not to like about that?
Just some ideas to get you thinking