little brother being obsessed with their big siblings. insisting that he needs to suck on big sis's tits like he did when he was little (he confused them once and was never corrected, ending up in weaponising this aspect) and always sitting in big brother's lap, moving around because he's 'energetic', just to feel big bro get hard under him and begin buckling his own hips like a breathless mess. None of his siblings correcting him on his 'innapropriate behaviour' and ending up in a polycule later in life >0<
Yes... I love breastfeeding... Big brother getting big sister pregnant just so little brother can drink her breastmilk (little bro is too young to be able to breed her :")
Even better if big bro and big sis didn't get along until little bro made them. (Kiddie pussy/dick got them hooked).
