Here's my script. Some stuff doesn't translate between languages, so you'll just have to put up with what I did instead. The gatekeepers of such things seem to view meaningless/confusing overly-literal renderings as the correct way to do this (other = wrong), which is a lot of why I no longer waste my time doing more than you see here.
1 little bubbles on right: huff❤ huff❤
BLACK SFX TOP RIGHT OF BUBBLE: splorrt! waoh!❤ tiny loser cock❤ you came already?❤❤
Cleaning crew coming through!!
main dialog: nee-chan... um, hi
whaa!? you came here too? Did your friends tell you to ask for your sister when you lost a punishment game?
... yeah, you guessed it
that's so sad... oh, well You're my cute little brother. I guess I can give my all to service you like any other customer
m... 'kay
by the way, daddy was here just before you
whaaah...
2 oh! Hayato, youre penis is pretty big, idn'it?❤ not as big as daddy's though
Don't compare me to dad
ahahah! sorry! sorry! but I like 'em right about this size (smaller text) 'cause the huge ones hurt
nee-chan, can we do it raw?
sure, why not? don't tell daddy, kay?❤
3 ah! that feels pretty good❤ I'm not sure how to feel about being a good match for my brother though
mnh❤ nee-chan, your pussy feels awesome
'cause daddy came a ton inside me and made it slippery, y'think?
ew... I didn't want to hear that
Hayato, you just need to scrape it all out for me❤ WITH YOUR PERFECT COCK❤
4 (top right bubbles) ah!❤
hayato❤
so rough❤ (above head)
(lower right) clean me out get all daddy's sperm out for me!
(top left) touching my womb❤ ahn❤ I love it❤ hayato❤ gonna come❤❤
Me too! Nee-chan!
I'm cumming inside! Take all my sperm and GET PREGNANT!
5 (three sfx around her head: huff❤)
oh wow!❤ it's really coming out❤
Hayato... you really wanna get your sister pregnant?❤
s-... my bad...
YEAH, IT REALLY IS BAD but... I could get addicted to this... ❤❤
6 small bubbles down right side: mmm, spraying inside❤ filling me up❤❤
I think... I'll get pregnant
oh, wow... we're all out of condoms❤
hahf❤ please, do me one more time❤ hahf❤
main dialog: so, um, Hayato y'wanna, maybe, start taking your baths with me?
bathing? with nee-chan?
You don't want to!? In the bathtub, we could do it every single day!
uh...
well, since nee-chan is asking for it... I mean, I guess we could... If you really want to
huh!? What's wrong with you!? Don't you WANT to fuck my pussy again!?
black sfx bubbles: twitch❤❤❤❤ twitch❤❤❤❤❤
sfx front of Hayato's pants: wriggle
7 Nee-chan! cumming!
big sfx: spurt! spluuuurt!!
hey, Hayato If you keep cumming so much inside me like this, Nee-chan really will get pregnant
sorry Nee-chan, but... I love you
awww, what am I gonna do with you?❤ since my cute little brother wants it... ❤ (small text) It's our secret from daddy, 'kay?❤