Gently.

It is entirely possible that Selas is such a well practiced actress that she even believes herself to be an innocent, or at least as innocent as succubus can be, virgin, but it is just as possible that she really has regressed to her maiden days. You've been with a couple of virgins in your day, and you remember how scared and nervous you and your partners were. So, on the off chance that her memory really is gone, you decide to be the bigger man and make her "first" time as gentle as you can.

Standing over the scared succubus, you tilt her head up and softly press your lips against hers. She pulls away almost immediately. "That, that was my first kiss." you hear her mumble, trying to hide her golden, blushing cheeks behind her fingers. Pulling her face back to you, you kiss her again, just as softly but briefly run your tongue against her lips.

Laying her down on the divan, you pepper her face, lips and neck in kisses while you undo the drawstrings of her dress. Slipping under it, your hand kneads and massages her breast, letting a nipple rub against your palm. Back up top, her moans and gasps sound either forced or muffled, like she doesn't know what noise she's supposed to make. You tell her to relax and that whatever sounds she makes is the right one. She whimpers and nods, before an earth rumbling moan comes out of her throat when you pinch her nipple. After telling her to compensate for volume, you have her undress and kneel on the floor with her eyes closed while you start undressing as well. Sitting on the edge of the divan, you tell her to open her eyes.

In a word, your cock is angry. It throbs and pulses mightily in between your legs, harder and larger than you've ever seen it. You're also extremely aware of what's going on in your balls right now. You can actually feel them pumping fresh cum up your cock with every heartbeat.

Selas, wearing just a pair of panties, stares at it cross-eyed while it stares back at her, precum dribbling down it's shaft. "That's... that's supposed to go inside me?" she swallows nervously. You nod and tell her that before that, she's got to get it ready so that it won't hurt as much when it does. She swallows again and asks you what she needs to do.