Soon you were taken back to the Gremory Family home along with Rias thanks to Sirzechs' Family Friend Grayfia taking you all there Via summoning circle teleporation.

Rias: Thank you Grayfia.

Grayfia: You're Welcome Miss Gremory. Your brother seems to be very interested in Mr. Y/n here.

Y/n: Please call me Y/n, Sweet Cheeks.

Grayfia: (Blushing) O-Oh of course, Y/n...!

Rias: (Thoughts) Is she also Interested in Him? I know every woman in my Peerage is but still, he has that aura of A Succubus.

Soon You and Rias were Taken into A Living room where Sirzechs were waiting for you two with A Big happy smile plastered on his Face.

Sirzechs: Oh My Baby Sister and Y/n, the Man who Killed The Fallen Angels themselves. It is Nice to see you two here. 

Rias: What do you need from the two of us?

Sirzechs: Now Rias I thought Father taught you better. We don't discuss Deals until After Dinner.

He then revealed A Huge Feast, as you walked over and began inspecting the Food.

Sirzechs: Now Please Enjoy.

Y/n: No offense Sirzech's But I have something better.

Sirzechs: Really? Now explain.

Y/n: Watch this.

You then used your powers to spawn all four of you some Rainbow pudding.

Sirzechs: Such A Peculiar Dish. What is this Made out of?

Y/n: It's A Pudding made out of the Rare Rainbow fruit which is Usually defended by Troops of Troll Kong but I was able to grab some.

Grayfia: How strange I have never heard of such things.

Y/n: It's A Different World. Try some.

Rias, Sirzechs, and Grayfia all tried some and they were immediately all in heaven as they were all able to taste all 14 different Flavors from the 3 steps of eating, chewing, and swallowing.

Sirzechs: Yes, This is it! You're Perfect!

Y/n: Perfect for what?

Sirzechs: It is our Family's want for you to marry My Little sister Rias and continue our family lineage.

Rias: (Blushing) W-What!?

Y/n: Hmm... I shall accept your Offer but I have A Few demands.

Sirzechs: Explain, please.

Y/n: (Produces Pictures of Tohka and Kurumi) These are my Girlfriends currently and I am currently Building A Multiversal Harem, I will marry Rias but I wish to have Asia, Koneko, Xenovia, and Akeno into my harem as well, but it's all their decision.

Rias: (Blushing) Y-Yes, I Know for A Fact that we will would accept...

Sirzechs: Good then! We shall set up Marriage preparations.

Rias was still Blushing as you just smiled, thinking of which world you would Visit Next.