Stick to dry humping but tell Alex to be careful

Alex continued to saw his cock between your pussy lips, dragging deliciously against your clit. Several more times, you felt him pull back far enough for the tip of his dick to graze against your opening. Each time, a slight thrill coursed through your body. If either of you were to change your angle even slightly, this would turn into much more than just dry humping.

"Be careful!" you admonished, "It felt like you almost went in me just then."

"Sorry," Alex responded, slowing his pace slightly; his face softened a little. "I was getting caught up in how good this feels."

"It unh feels good for me, too," you panted. "How close are you?"

Alex trusted a few times before responding. "I don't think I'm that close." The two of you continued to rut at each other, the pleasure building up in your core. You felt Alex's movements get a little more erratic, and his dick caught at your entrance again.

"Alex!" you said through clenched teeth.

"Sorry, it was an accident!" Alex kept thrusting regardless.

"Alright, how close are you? When you get close let me finish you with my hand or something."

"Yeah, I'm getting kind of close," Alex sighed.