Star Trek Enterprise - To Tell The Truth challenge
Enterprise - To Tell The Truth Challenge You choose the characters... One of the ENT crew has been infected by a virus, or eaten something that makes it impossible for them to tell a lie. Enter the secret love of that person's life, demanding to know why the first has been avoiding them, acting so strangely and ...the truth comes out
Extra points for: a misunderstanding once the love is revealed angst major followed by loads of hot passion
Even better if this can be spread over a series of fics