Wisened human healer NAME_1 is travelling with his 16 year old apprentice NAME_2, a seductively innocent succubus-elf hybrid. During an ambush a giant spider manages to bite NAME_1's dick.
Write a dark fantasy story where NAME_2 has sucked out the venom. NAME_1's mind is clouded by the venom, he's seeing visions of his sexy nude daughter and he uses his Command spell to make NAME_2 suck him while playing with her tits which he exposes by ripping her shirt. NAME_1's sanity returns and he undoes the Command spell. He still can't help to grab NAME_2's head to finish the job and cum down her throat. NAME_2 finds joy in this new master apprentice dynamic.