Yep, onto the next morning!

Issei moaned as he slowly woke up in one of the cots in the nurse's office, and paused as he processed a certain feeling in his morning wood... it was quite pleasant, and actually starting to become familiar... the feel of a wet mouth moving back and forth on his erection. He tilted his head up. Sure enough, he saw Rias's mane of red hair obscuring his view of his lower half, bobbing up and down. "...unh..." he grunted.

"Oh, morning, Master~!" Rias chimed as she pulled off of his cock, stroking it with a soft hand.

"...this is quite the wake up call," he noted, smiling as he reached down, petting her head. She smiled, opening her mouth again, and engulfing his cock into her mouth again. As she worked, he took a moment to admire her ass.

"Well, you two seem to be enjoying yourselves quite a bit," Akeno noted, pulling aside the curtain, currently wearing only a lacy set of black bra and panties, in order to watch.

"Ah! Akeno!" Issei flushed as he looked at her barely clad form. Rias grinned around his cock and only sucked harder.

"Don't stop on my account..." Akeno crooned as she cupped her own breasts. "This is quite the show... unless my permission to watch you both has expired?" she asked, giving him adorable pleading eyes.

"...not at all!" he replied, barely hesitating. He bucked his hips slightly into Rias's mouth as she kept going. The voyeuristic Akeno's presence only enhanced his excitement, and it didn't take long for his cock to start throbbing in her mouth, and with a grunt, he came, his shaft erupting up into her oral cavity.

She gulped it all down, and pulled off, grinning. "Mmm, enjoy that, Master?" she asked him.

"Yeah..." he nodded. "You?" he added, knowing the answer, but he enjoyed hearing her say it regardless.

"I always love giving you pleasure, Master..." she giggled.