[From the Source]

Rain and thunder silenced the electricity in the building. The blackout would surely leave the lights non functioning until tomorrow. If there's one thing Sceptile feared, it was the dark. Not Dark types, just the dark itself. She never liked being in a pokeball for this same reason. The loneliness coupled with the loss of her sight mortified her. It was irrational but Without the security of the lights, it would surely be a long night for her. Or thats what it would seem.

"Um, hey..... you can come sleep in my bed if you want."

Her head perked towards her trainer.

"Just try not to take up too much space alright?"

Sceptile was awash with relief....... and of something else.

She wouldn't admit it, but years of battling and bonding had her falling for her trainer. Love, and of course lusting. She has had rather dirty thoughts and fantasies involving him in the past and more frequent than she would like to admit. And it is not uncommon for her to sneak into a private space to relish in these fantasies with the aid of her claws and an active imagination. She came to the conclusion that such a relationship would never come to life, so dreaming was the next best thing.
However, now she see's herself getting one step closer to bringing it to reality.

Her and him, sleeping in the same bed together. Her mind of course associates with the bed with intimacy. The association alone brought arousing and lustful thoughts. Her face turned a light shade of pink as her tail swished back and forth. The trainer didn't notice her change in body language though.

She thought of her master pinning her to the mattress like a hungry beast who snared its prey. She thought of him parting her legs and thighs to easily access her, and her presenting herself to him like the naughty reptile she is. The thought of him holding one of her legs up as to get more of himself into her. Thrusting and thrusting into her as her arousal begins to fog her mind and fill it with nothing but the carnal bond between him and her. The emotions and euphoria, not to mention physical pleasure building and building until finally years of unrequited love and sexual frustration being finally at long last satisfied with the peak that they would reach together as the orgasmic high and sexual bliss consumes them both, not to mention the pride of bringing her own trainer to finish.

As she snapped back to reality she hadn't even noticed she was already at his bed side, and he was in the bed. Facing away from her but leaving space for her to sleep in. She noticed an accumulation of moisture in between her thick thighs. She managed to keep it hidden well enough for her to slip into the sheets with her trainer.

As he fell asleep though, the tempted Sceptile's claws wandered in between her legs and her waiting arousal, it's not quite what she had in mind, but it was the best she could do at the moment. And best as of now is good enough.