The NTR is an incentive. The nudge to bang literally your entire family and their friends despite your clear hesitance on the matter on most of them as its fuck them or he will leading them to a life of reclusive misery, exploitation or chastity and a gaping set of beef curtains like no surgeon aint ever seen before. Your intentions are somewhat more pure as you can
(a) opt out and let them be molested by a sick perv
(b) rat out the old bastard leaving your family homeless, poor and on the streets or
(c) have hot steamy sex with busty, hot, willing and horny women left right and centre to save them like a fucking hero!
Not all hero's wear capes you know.