"Mmm, now you wish to learn? When almost every other time I want you to use your magicks you attempt to make me do it for you instead? Maybe I should just let you stew for a century or two."

Not that they have a century in all likelihood. His retort is also not meant to be taken seriously, for it would be pretty weird to want to start an argument with someone who literally still has their penis inside you.

Despite being difficult about it, there is something he wants.

"...Show me the spell?" There is no 'please', though it is implied by the tone. It doesn't matter if it's used for sex, there is still a lot he does not know about manna-magic and he wishes to pick it apart.