You then were cut off by lips pressing to yours, your eyes wide as you blushed darkly than you were previous. You soon relaxed, kissing him back. He wrapped his arms around you, pulling you closer. Your hands rested on his chest plate, careful not to hit any buttons or the nob on it. For a robot.. he was very good.
He then deepened it, a metallic tongue running over your bottom lip. 'Strange... when did he get a tongue?' You thought to yourself before opening your mouth just enough for his tongue to enter your mouth. It's cool surface running over what it could before meeting your own, your tongues wrestling and dancing perfectly against each other. The feeling was amazing, robot tongue or not. After a few minutes he pulled away from you, smiling.
You couldn't help but smile back, giggling a bit. He chuckled along with you. You then stared into each others eyes, seemingly lost in his pink shaded ones as he was lost into yours. "Y/N...." Mettaton whispered low. "Let's have a little...heart to heart..." You soon saw Mettaton's soul leave it's container from his belt.