yellow head have big brain. i like him

There's puny brain, qhere no cells survive for long. Then there's normal brain, where cells live nice consistent lives, and then there's big brain, where cells live long enough to form thoughts of their own and cause mutations in your lime of thought. Yaoi logic humbly resides in the big brained, tempting their line of reason to morph into that which makes mpreg the perfect conclusion.