You hold off

You focus on Grandma and the north pole and those delicate nails running gently up your shaft. You break off the kiss and gasp. "Fuuuck, Erica sto-" You groan before she quickly kisses your neck, nipping lightly at the skin before she leans back with an innocent flutter of her long lashes.

Erica presses a finger to your lips and smiles "Shhhh Lexi, don't let mom know what we're doing" She coos before crawling down the bed and closing her laptop and shifting it aside. She gently kisses the tip off your cock, looking up at you. "I really need this, please"

Erica slowly takes your 5 inches into her soft pink lips, it doesn't take her long for her nose to touch your belly as she takes in your entire length, she then starts bobbing up and down. You seem to almost naturally lightly Grasp Erica's pigtails and this seems to encourage your pretty cousin. She starts bobbing faster and making gagging noises as she does.

Erica's little show of gagging on your dick seems to be all you need as your head rolls back and you grow short of breath. You naturally grip Erica's hair hard as your cock finally erupts into your cousin's waiting mouth, you let out a satisfying if slightly effeminate groan.

You snap back to reality and let go of Erica's hair when you hear the bedroom door slam shut. Fuck.