/lit/ - Literature

I'm writing a 20 year old woman grooming a 13 year old boy

I intend for her to mold him into a sexually aggressive brute, but she wants to remain a technical virgin until he comes of age

I wrote her to start off sexually pleasuring him with, in order
>handjobs
>dick kissing
>blowjobs
However I wanted the boy to, after some time and after he hits puberty in full swing and becomes pretty big and strong, to want to go all the way too early

The dynamic I wanted is for her to be in complete control and more or less has her young brute of a husband eating out the palm of her hand. What are some ways she can divert his focus on taking her until he comes of age?