Does this mean that Sada-chan and friend is up stairs from Onii-san . . . .

It's a small world.

Salary man: "my time has come."

Upstairs having fun, neighbor is having fun now its onii-san time.

Ah, that sweet sound of love.

How... do you kill something that has already died?

That goddess in Jitome's place needs a talking to by Amaterasu... A LOT.

correct me if i am wrong, but they have already done it right? at least i remember ai-chan saying something about lubricant for her breasts??? or was that just something someone here mentioned?

qi said:

correct me if i am wrong, but they have already done it right? at least i remember ai-chan saying something about lubricant for her breasts??? or was that just something someone here mentioned?

Yeah, it's implied they've done it a couple of times. It's just this time hearing the... commotion going on upstairs has got these two really excited.

[deleted]

Looks like the 8k HD made her quite tasty.

The horny... it's Contagious....

qi said:

correct me if i am wrong, but they have already done it right? at least i remember ai-chan saying something about lubricant for her breasts??? or was that just something someone here mentioned?

Its implied. I think Himura is being deliberately vague/noncomittal. Strongly imply, never comfirm. The lubricant thing I've seen translated as lotion as well and didn't really say much.

Now those are some quality "bedroom eyes"...

Added the remaining commentaries, as well as my translations.

For those wondering about the second commentary, Tawawa Heights is the name of the apartment complex that Onii-san, Kouhai-chan, Gimai-chan and her stepbrother, and Sada-chan and her "host" live in. Someone made a handy collage here showing crops from the posts where the residents are shown to be living in this complex.

With how many couples there are and the apparent lack of soundproofing, it's just going to be a chain of loving every night someone do something.

Finished going through all the comic pages in this pool to tag the newly created tawawa_group where appropriate. Turns out there were many more instances of the Tawawa Group's brand than I had expected!

qi said:

correct me if i am wrong, but they have already done it right? at least i remember ai-chan saying something about lubricant for her breasts??? or was that just something someone here mentioned?

40 & 41 strongly suggest it along with 52 somewhat. What you are referring to with the lotion/lubricant is from Sono α.

Stay strong Ai-chan, you still have school.
Plus, only like 3 already had their fun time: Maegami-chan, Step-sister( I think) and Sada-chan

qi said:

correct me if i am wrong, but they have already done it right? at least i remember ai-chan saying something about lubricant for her breasts??? or was that just something someone here mentioned?

It's been hinted at numerous times, as stated before in 40-41, 52, I'd also like to add 192 (where she takes home the maid outfit from the school festival) and 259 (where her workplace kouhai asks why she always takes her work uniform home).

Wilfriback said:

Salary man: "my time has come."

actually it came 3 years ago

her predator eyes

MR1422 said:

actually it came 3 years ago

4.8 years ago

DeadW4nderer said:

4.8 years ago

Well.... With the power of hindsight (which I think you guys had back 3 years ago too),
I'd say it happened a bit sooner than that.