They are, aside from some cuddles...

"Mmmnh..." Rias cooed as Issei pulled out of her, and rolled onto his side next to her. "I wish I could stay the night with you, Master, but my family would question where I was..." she admitted with a pout.

"...what if I wished we could just stay and cuddle without that happening?" he quipped with a smile.

"...for a small wish like that?" Rias crooned. "I doubt it would raise alarm bells..."

As she nuzzled against him, he blinked. "What do you mean?" he asked. She giggled a bit.

"Master, Devils are pretty powerful entities, especially the top tier ones. Even though the Lamp is not of this world, a careless, blatant wish that alters our whole political landscape would almost certainly cause someone to notice and realize something is amiss. But more subtle wishes that don't do much? We can easily get away with that..." she explained.

"...I see," Issei noted, nodding. "Then I wish for that..."

Rias snapped her fingers, casting the small spell, and cuddled against him more forcefully. "Mmmnh..." she crooned again. "Done, Master. Now we can just relax a little..."

He laid his hands against her breasts again, making her moan. "So... I guess we just fall asleep together then, and maybe if we're up early enough in the morning, we can have a bit more fun before school?" he suggested.

Her expression brightened immensely at that idea. "Of course, Master! In fact, I have a perfect pillow for you!"

"...a pillow?" he blinked.

"Two pillows in fact~!" she giggled, and winked at him.

"...oh!" he realized, blushing as she laid back on the bed. He grinned, taking her offer as he laid his head right on her chest. She proceeded to pull the covers over them as they relaxed in the bed together.

"Good night, Master," she purred, gently closing her eyes.

Good night, Rias..." he replied, following suit, and allowing slumber to claim him for the next few hours.