Rub against her.

You wrap your strong arms around her and start to rub your shaft up and down against her soft, pink, pussy lips. She lets a moan into you as she continues to kiss you, now more vigorously. You push your shaft harder and rub slower, causing her body to give small jerks especially as the veins in your cocks hard shaft rub across her clit.

She pulls back with pure lust in her eyes as she forcefully grabs your hand and yanks you behind her, rocketing through the water, until you break onto a beach, where she hungerly climbs atop you trying to position herself for penetration.