The condition to pick Wade over Ian is as follows:
Python:
elif ian_cuck > 1 or lena_cheating > 0.5 and lena_axel_fuck:
l "Hey, can someone put some sunscreen on my back, please?"
if lena_cheating == 1:
"I wanted to get my hands on her, but she had been rather distant since she arrived yesterday. That uneasyness made me stay back, wondering once again what could be wrong..."
else:
"I was about to volunteer, but then she looked at Wade and handed him the bottle of lotion."
l "Do you mind, Wade?"
w "No problem..."
So yes, in your case not fucking Axel is deciding factor: if Ian isn't on cuck route then Lena has to fuck him earlier in the chapter and don't resolve to stop cheating.
It's not a requirement:
Python:
# mmf threesome
if lena_fty_3some == 1 and holly_trinity == 0 or ian_lena_crisis:
Lena will also bring up MMF if she has such fantasy, as long as the throuple route was shutdown.