Two weeks later…

My three races have been acquired along with Rias' bloodline upgrade. Aside from a strength increase, I now felt the presence of something in my chest. It took all of my sheer force of will not to summon element after element and inevitably blow our place up. Rias felt similar, she felt vastly stronger but because she didn't want to erase part of the apartment she held back on actually using her power.

I will say one thing, sex while flying is an entirely new sensation.

"T-this is…AHHHHNNNN~ CHEATING~!" Rias screamed aloud, body going stiff as I lightly rocked inside her from behind. I smirked, but before I could continue she mustered the strength to flip me over onto my back and remove my cock. She sat on my stomach, panting and glaring down at me.

"That skill is banned!" She chastised. "It ruins all the fun, no one wants to just cum every millisecond." She huffed, her chest still heaving and her pussy folds still twitching.

"Noted." I held back a chuckle, mentally deactivating the [Incubus' Touch] skill I had just acquired. It was just another one of the dozens of skills in my skill tree.

Pouting slightly, Rias leaned down and pecked me on the lips. "Good, but I think I deserve a little payback." The expression on her face told me she was up to no good, and indeed, she really wasn't as a second later her folds engulfed my cock and I was back inside her. This time though, almost immediately, I felt my energy being drained from me. The weakness set in but I didn't do anything to stop her. "This is definitely banned."

She rolled her eyes, biting her lip as she wiggled her hips in circles on my cock. "Well obviously, I much prefer to drain you naturally." She licked her lips, eyes rolling around in her head as she lightly lifted her hips. "This is just your punishment." She slammed back down, her walls wrapping tightly around my girth and her cervix stretching further to accommodate my length.

"AHNNN~" She mewled head falling back as she gripped the sheets tighter. Her pussy was like a vice, gripping me tighter and tighter. The weakness kept settling in, and I did nothing to stop it. Instead, I gripped her large bouncing mounds and pulled her forward. I pulled her into a searing kiss, and really start pounding into her bouncy ass before I became too weak to move. I pinched and pulled her hard nipples, and dominated her tongue with my own. Enjoying how even as my vision was fading to black she was still like putty in my grasp. I held her still, dispensing my load into her womb until it started to expand from how full it was. She mewled into my ear, Pitifully announcing her orgasm as the darkness overtook me. Whatever mess came about after my cum exploded out of her when my cock fell out was hers to clean.

When I finished my race selection, I looked around the skill trees and finally got to see what I had to go through. The first one I looked at was from my devil skill tree. The [Incubus' Touch] skill came from this. My sin supposedly being lust, I could only guess I got a fitting template to match. Most of them had to deal with seduction, such as [Pheromone Aphrodisiac], and [Natural Pleasurer]. Funnily enough, that last one was of the few I didn't have to purchase as I already had it. What a way to stroke my ego.

Thankfully, not every skill was like that, and there were some normal devil-related skills. One's that amplified dark magic, or just general body amplification, like one that removed the sun's effect on me, and another that increased my resistance to holy, and light-based attacks. I was disappointed when I saw an utter lack of any bloodline traits, but that quickly changed when I saw what was at the top of the list when I completed all the skills on the lust path. [Clan Trait: Asmodeus]. I heard from Rias that even the current Satan Asmodeus wasn't actually of the Asmodeus clan. The clan had died out after the civil war and he was just given the title. Regardless, that trait would undoubtedly be extremely helpful, too bad the prices for the skills up until then would start skyrocketing.

Other than that, my dragon race skill tree had a similar thing that would allow me to step into the realm of a dragon king. Aside from dragon fire, draconic transformation, and the like, the other skills were really just things that added to my 'lust skills'. As much freedom as I thought I had with my build, I was clearly being led to the 'Sex God' route.

My human skill tree was not much to speak about. It did offer a variety of boosts related to adaptation and resistance, but not much else. But, that wasn't why I kept it. Nope, the reason for that lay in the gauntlet-shaped icon a few scrolls down from skills.

Unfortunately, most of what Rias had called 'Longinus' were taken, probably in use by the residents of her world. But, there was one that was available. One Rias had never heard of. It was called [Treasure Usurper] and this time around it actually came with a description. It manifested as a silverish-blue glove and served the sole purpose of allowing me to siphon off the origin of one's power as a treasure. Understandably, it was priced at 10,000,000 LP.

Between that, my race skills, and my stat upgrades, along with Rias' own stat development, maybe it wouldn't be such a bad idea to upgrade the house even more.

Before I knew it, an entire year had gone by. Our sex life progressed into obscene proportions. Our closet was overflowing with clothes ranging from a sexy bunny girl to ecchi anime girls. There wasn't a position we hadn't tried and a hole I hadn't poured my cum in, besides her eyes, ears, and nose. I feel I have to make that very clear. Our apartment had turned into a full mansion, with game rooms, hot springs, and even whole rooms dedicated to our debauchery. Despite that, we still had yet to see even a glimpse outside of this house of ours. But, it was our home nonetheless. We had fallen into a routine over the year and a half we've been here, but as it turned out, we'd be leaving it all behind soon enough.

I had gotten the Clan trait and progressed through the skills until it was going to take years to advance even once. The same went for our stats and her own clan trait.

We had noticeably gotten a lot more attractive, such was to be expected as devils got more powerful, and I suspect my clan trait added to it. I now considered myself someone who actually looked worthy of the girl I had been making squeal on my cock over the last few months. Our objectives had been achieved, we were strong, definitely strong enough that she could handle that pansey trying to take the women that had been made mine in every aspect. Now, we sat on the couch. Fully dressed after having cleaned up all around the house.

"Is it weird that it feels weird having this on?" Rias asked, a bittersweet expression on her face.

"I think you're just too used to being nude," I said truthfully. "That and you've definitely gone up a size." I pointed to her chest which looked like it might burst through the cloth any second.

She looked down, cupping them for a feel with a contemplative look on her face. "I guess they have, I have heard they grow more when they're constantly played with." She teased, nudging me with her shoulder and giggling.

Too bad, teasing on that level wasn't going to do much to me. "I'll happily make them bigger."

"They are already quite heavy, please refrain." She denied, moving and planting herself in my lap so she could look me fully in the eye. "Akito, is it so bad that I don't want to leave?"

I took a second, seeing the contemplative look in her eyes. "Well, you still want to see your family again, I think you just don't want to say goodbye."

Her face fell, and soon enough I felt tears drip from her chin onto my pants. I held her closer, rubbing her hair. "If you want, we can go back to our bed and wait another day?" I offered and felt as she nodded in my grasp. Like that, I held her and walked back over to our room. It was the first time we cuddled on that bed while still being fully clothed. And, she never did stop crying until several hours later.

We were back in the living room, this time with a much less somber mood.

"We don't know where you'll end up, but look for me as soon as you get there."

"Got-."

"I'll be in the underworld but you should still be able to get to me."

"Under-."

"And make sure you're not seen, let's get settled before we start anything."

Rias went off on a tangent, reminding and scolding me before I even did anything. I waited for her to calm down and answered with just a nod before she could remember something else to say.

"Good." She sighed, pulling me into a deep kiss before backing away and pressing a few things on her own hologram. "Ready?" She asked as I did the same and nodded.

"Alright, love you, don't take too long." She said before suddenly she vanished right before my eyes.

I pressed the same button an instant later and watched as the world warped around me.

Everything faded to black, but before I could panic the hologram appeared before me.

[You have left your dimension, the entrance back will be blocked for a set time. System features excluding the acquisition of LP will be disabled until your arrival back.]

[Good luck, host.]

I couldn't help the grin as the darkness was swept away and replaced with brightness. Rias was going to jump for joy at the news.

A/N: Purposefully kept the time until they can return ambiguous so I can adjust it as I see fit. They're off to DxD now. I know the dimension arc was rushed so if there is anything specific you guys wanted to see between them leave a comment and I'll consider an omake/side story for it. Also, sorry for those who read the chapter already, it was unedited and I accidentally posted it.