>>1 Fisrt off, it was a dare.
That's pretty much like a verbal legal contract.
You actually
do have an obligation.
Not only a legal obligation but a moral obligation as well.
You don't want to be seen as a welcher, do ya?
Also, your cousin sounds like he is probably in to you.
Like, I don't think he just likes you, I think he like, likes likes you. ;DDD