Nothing big during classes or on the way, but Rias does want to do something after!

Before picking up her clothes, she paused, and then grinned at Issei. "You like, Master?" Rias asked, giving him a twirl, still topless, only garbed in her harem panties and loincloth. When her back was to him, she rolled her hips, drawing his gaze to her ass. "I know you're a tits man, but I hope you can appreciate a good ass too..."

"I do in fact prefer boobs, but that doesn't mean I don't like a good butt," Issei blushed as he stared, blood dripping down his nose. It was amazing just how shamelessly sexy she had become!

She giggled a bit, removing her loincloth and putting her harem top back on, now dressed only in the harem bra and panties. They were so much more comfortable than her actual bra and panties, so she decided to wear them under her uniform. She got dressed, and turned to Issei. "Oh, there's something we need to do after school," she added to Issei.

"Oh?" Issei asked, raising an eyebrow. "What might that be?" he asked, quickly getting dressed himself, before catching a whiff of his armpit. He grimaced. Right, he hadn't showered last night, and worked up a slight sweat fucking Rias's tits on top of that, better throw on some extra deodorant, since there wasn't exactly time to shower anymore.

As he attended to that, Rias smirked, and said, "Come to the Occult Research Club after classes. I'll introduce you to our Peerage."

"Occult Research Club? Oh, right, you are in that, aren't you?" he paused. "...it's basically a front, isn't it?"

Rias laughed. "Yeah, exactly! No one questions why we have pentagrams or other Devil paraphernalia when they think it's just some kind of hobby," she explained proudly.

"Makes sense," he nodded as they finished getting dressed. "I guess I'll see you there?" he then asked.

"Of course!" she nodded. "And make sure you're prompt: I'll be showering in there first thing, if you're quick enough, you might get to join me!" she headed for the window.

Issei blinked. "Wait... you have a shower in the club room?" he asked after her, but she only laughed as she exited the house. Issei shook his head, deciding to pursue that line of questioning later. He quickly headed out the front door, and went to the university. He grimaced in the sunlight. He had really started feeling weaker during the morning and day since his **** and rebirth, but so strong at night. Suddenly, that mystery made sense. He was a Devil now, they must have some degree of weakness to sunlight or something. At least he wasn't bursting into flames or anything.

He reached school, and went through his day without incident. He did make damn well sure not to tell his friends about Rias though... knowing them, they would loudly and publicly ask him to grant their wishes.