Might as well

Annabeth got two her knees and slowly approach her boyfriends lower area. Being careful now to wake up him, she pulled off his boxers and stare at awe as his 6 inch long dick sprang to life. 'He must be having a very sexy dream to be able to get this erect' she thought to herself as she heard another moan from Percy, which turned her on even more.

She grabbed his dick gently and started to pump it slowly, making it twitch along with Percy. After awhile she decided it was enough warming up as she tucked her blond curls behind her ears before leaning in and placing his dick inside her mouth. Slowly but steadily she sucked on his dick, enjoying the way it taste inside her mouth, also looking to the side to see any signs of him waking up. But all she got was even more twitching and moans, not that she wasn't enjoying it. Just then Percy moaned "Annabeth" in a deep and husky voice and would definitely make her legs give out if she wasn't on her knees already. Feeling horny and aroused she checked to see if he was still asleep and immediately shoving her hand into her panties to massage her now leaking pussy.

She started to suck even faster as Percy's call for her increases too. "Mmmm....Annabeth.....wait....whats going on?" Hearing the confused tone in his voice she doesn't need to look to know that he was awake. However she was still invisible and it would take awhile for his seaweed brain to register that she was giving him an invisible blowjob.