Re: [Butakoma 300g] どろっぷ ふぁくとりー (Drop Factory)
The mode where enemies are already aroused, right? Google translating the manual said something like "disturbance" mode, so i don't know :O
Well, don't know if this help, i couldn't test it right, but i think using the excite skill while in that mode helped, and once you get a combo attack scene from a combination of monsters, it will trigger more frequently now in every fight with that combination. It felt like that at least. Btw, the combo attack precedes everything, no matter what you do, if they are going to do it in that round, they'll go first, always.
To look for the combinations i went all around the place fighting, if i didn't know if given combination of monster had a combo attack, i used the excite tech a few rounds, if nothing, milk bomb them (i could kill with one shot any monster, except the horse, and i was faster than any monster). If i thought they didn't have a combo attack or has already seen it, milk bomb them in the first round. And that's why it gave me the impression they did it more frequently after the first time. Once i found one, even if i wanted to kill them fast (to prevent pregnancy and annoying waste of time), i could see them doing it a lot because it always goes first in that round.
If it's not the use of excite tech, maybe its your level. I was around 25 when i got the first one out of the blue. I'll check the event code in those 4 fights, see if i can understand what triggers it.