Warning: Again, don't know what turn on means Shield your innocence!

Virgil:
His chest and stomach or when he's shirtless. You occasionally get caught staring at his chest. You can't help but stare at your boyfriend's pale chest.

Roman:
His singing voice. It sends shivers down your spine and it just makes you love him more. Since you tease him with your voice, he likes teasing you with his voice too.

Logan:
When he's without his glasses or when he is confused about lovey things. You find him so attractive without his glasses on or whenever he is asking you about lovey things. So, you take his glasses a lot. He sees you with his glasses on and you see him with his glasses on.

Patton:
His kisses and when he is unintentionally sexy. His kisses are the best thing to you so it's not surprise that you get turned on by them. He also tends to be unintentionally sexy. He doesn't do it on purpose of course but he can't see how he does it.

Deceit:
How he's putty in your hands when you touch his scales/face. You love when he practically bends to your will when you touch his scales, this almost always ends up in sex because well sensitive scales and all.

Remus:
The grey streak in his hair and his mustache. Surprisingly you love the only two differences between him and the others. You feel like he is way different than the others but you love it anyways.

Thomas:
When he gets angry. This happens rarely so it kinda surprised you when he first got angry. You would never instinctively make him angry but you love when he does because he looks cute when he's angry.