1.
Throbb, Dicksprout* and
Virection Pill can add a dick if you don't have any.
Throbb is cheapest but causes Taint, Virection Pill does not grow balls, Dicksprout lets you choose if you grow balls or not and can internalize balls if you already have them.
Throbb and Dicksprout will not create a 2nd penis.
Virection has a chance to create a copy of (one of) your dick(s) when used. You can also keep using the
Dong Designer until it splits your penis, but this increases Taint.
*No Wiki page yet, buy from Sera.
2.
Pussybloom will add a vagina, if you don't have one already. Since you only want one, you don't need the more expensive Pussyblossom.
3. Foxfire gives up to 4 breast rows, so either save-scum and end the effect when you have your 3 rows and everything else*, or remove
rows and re-grow at the end. Unfortunately, it seems most methods of removing rows remove all but the top.
One idea:
Uthra Sap* removes all Flat rows, Foxfire's extra rows start as Flat (unless lactating, then they're A-cup). Either use Uthra Sap to remove all but one, then wait, or increase the size of the other two, then use Uthra Sap.
Variant:
Pupper Poppers will add rows that are a copy of the one above. Use 2 for your three rows (so they're larger than A Cup), then remove the 4th (flat) via Uthra Sap.
*Uthra Sap decreases the size of all rows, so you may want to overshoot your target size a little before using it, especially if you go with the Pupper Poppers. Most Breast size increasers only affect the top row.
I suspect Kesil misinterpreted your 6 breasts as 6 breast rows. The largest number of breast rows on a biped by any TF is 5. If you want more, you have to become a Naga first, then use
FrontRack Cream. The extra rows are not removed when going back to biped.
Not only is there no option for more than two arms, there will never be. The reason given is it makes writing scenes much more complex because you'd have to account for them.
It does seem strange when there are characters with multiple sets of arms (Dane, Dr Lash, Gold Myr, Bothriocs) and Steele can have 6 legs, 6 wings and 10 prehensile tails, but that's how it goes.