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Try tongue-kissing if it's clear he wants to take things up a notch. Use your tongue sparingly. Avoid biting or giving him a hickey. Explain your preferences to him in a gentle way. Put your hands to good use while you're kissing. Experiment with different techniques to keep things interesting. Leave him wanting more.
Open your mouth slightly and part your lips enough that you could comfortably get your tongue through them. Lightly run your tongue over his lower lip, then pull your tongue back. Slowly and softly dart your tongue in and out of his mouth, pulling back for a few moments each time. For example, you can touch his tongue with yours, then pull back. Circle your tongue around his, then pull back. If you don't pull back occasionally, the kiss might feel aggressive and drool will definitely become an issue! Pulling back also gives a chance to catch your breath. A light nibble on his lower lip might be okay every now and then, but definitely avoid biting him or getting your teeth involved in any other way. Gentle kisses on the jaw are great, but don't suction your mouth to his neck like a vacuum hose. Most people just aren't into hickeys! Plus, leaving behind visible traces of your make out session could get you both in hot water with your parents. Keep it low-key. If his kisses are more aggressive or faster than you'd like, don't suffer in silence! Pull back and whisper something like, "I like being kissed like this." Then, demonstrate exactly what you like. He'll appreciate the direction! Don't just let your hands sit there limply⁠—use them to make the kiss better! Pull him closer and try resting your hands on his shoulders, hips, chest, or the sides of his face.  You could also try tangling your fingers in his hair. If he seems uncomfortable with any of your touches, reel it in. As you get more comfortable, you can make the pressure more insistent or the kisses faster. You can also try changing up the intensity and speed. Avoid settling into one technique for too long! Ending the kiss before it gets boring is always ideal. If you stop while it's still fun, he'll instantly be looking forward to next time! Pull back, look into his eyes, and smile before you part ways.