She must Control herself

Hermione then slapped her face a bit and got her mind out of the gutter. Hermione then began her meager meal of gathered fruits that Harry had acquired to nourish themselves. This was going to be a long month but so long as they had each other they would make it through and survive. The couple at in silence as Harry fed the fire every so often to keep it burning strong for them.

"Alright Harry you take the first watch while I get some rest." Hermione said as she went to the roll of palm tree leaves, they set up as their makeshift beds. While Hermione moved her thoughts wondered if Harry would have the courage to crawl over to her and jerk off on her sleeping body.

Crawling over to her spot Harry took one small glance at her as she crawled and smirked a bit with his cock growing hard in response. Focusing on the fire Harry waited for Hermione to fall asleep as he considered some ideas. On one hand they were out here, and no one would judge him for it. On the other hand, he should also hold himself until after they get their shelter is built. Both decisions had a lot of pros but the cons are hidden aswell.

A.) Use Hermione as a masturbation image

B.) Hold out for a bigger orgasm later