Some sexy stuff, while Akeno wants to watch.

"So... Master," Rias purred, approaching Issei in a sultry manner and running her hand over his chest and making him blush. "Seeing as we have some time before we get busy... What say we get... Busy?" she crooned as Kiba and Koneko left to get something for them all to eat while waiting to go deal with the Stray.

"Um, I'm game, but..." Issei blushed, and glanced towards Akeno.

"... actually, do you both mind if I watch?" Akeno asked them both. Issei blinked and stared at her.

"...you... Want us to fuck in front of you?" he stammered, blushing.

"...like you'd say no to watching two girls go at it?" Akeno raised an eyebrow. "Assuming you had their permission of course."

"...true, it's just... I didn't think you were interested in being..." Issei started to say, before Rias raised a hand.

"She's not interested in joining in, at least not yet, she just is interested in a show..." Rias grinned at him. "To which, I wouldn't say no. It's up to you though..."

Issei paused and considered it as Rias began stripping naked without a care in the world. "...okay, but no judging anything we do, okay?" he agreed with Akeno.

"Nope, never!" she assured him, sitting on the couch. "Besides, even before becoming a genie, Rias was often naked around us, we're not very judgemental..."

"...what about Koneko?" Issei remarked.

Akeno sniggered and said, "Well, yeah, she's a bit more... Skeptical of open perversion, but even she is mainly just suspicious of what you might be making Rias do."

"Fair enough," he nodded, beginning to strip as well, Rias already standing naked.

"So, Master, what do you want to do first?" she asked him, posing sultrily.