HuniePop 2 - 6 Wings route

HuniePop 2 has a lot of randomness in how it chooses what pairs are available to see in each day phase. Luckily, it places high importance on unfinished pairs, so you'll never be unable to make progress, but it's impossible to concretely date a specific order of pairs every time.

However, 6 Wings is short enough to narrow it down to only 3 branching paths, two of which are the minimum phase count. I focused on the introduction pairs and aimed for the lowest total day phase count, while figuring out the branch as soon as possible. Non-intro pairs have shorter introductions, but require more RNG and reaction to make use of, without needing extra phases.

To reduce the potential for RNG in the two ideal routes, I date all 6 pairs, before getting any wings. The location for having sex is random, meaning that it can block off potential meeting locations. That randomness leads to a very small chance of the non-ideal backup route falling apart (but keep going anyway, extra phases aren't that bad!). To have sex that many consecutive phases, Lillian & Zoey is a must, as they're the only Evening intro pair. Therefore, Ashley & Lillian is also a must.

Now, here's the 3 routes I came up with:

ASHLEY + LILLIAN (37%)
(Depending on who's at Hotel Lobby evening 1, the route has two different sets of pairs)
afternoon 1     - Ashley & Lillian
evening 1       - Lailani & Jessie OR Lola & Nora (both Hotel Lobby)
night 1         - Lola & Abia      OR Lailani & Sarah
morning 2       - Ashley & Polly
afternoon 2     - Lillian & Zoey
evening 2       - Jessie & Brooke  OR Nora & Candace
night 2     (W) - Ashley & Lillian
morning 3   (W) - Lola & Abia      OR Lola & Nora
afternoon 3 (W) - Lailani & Jessie OR Lailani & Sarah
evening 3   (W) - Lillian & Zoey
night 3     (W) - Jessie & Brooke  OR Nora & Candace
morning 4   (W) - Ashley & Polly

ASHLEY + POLLY, LOLA + NORA (23%) (the best one)
(I like this route the best because you meet all 4 piece preferences in the first two phases. Variety is good for both giving smoothies and plushies/perfumes)
afternoon 1     - Ashley & Polly
evening 1       - Lola & Nora
night 1         - Ashley & Lillian
morning 2       - Lailani & Sarah  OR Lailani & Jessie
afternoon 2     - Lillian & Zoey
evening 2       - Nora & Candace
night 2     (W) - Ashley & Lillian
morning 3   (W) - Lola & Nora
afternoon 3 (W) - Lailani & Sarah  OR Lailani & Jessie
evening 3   (W) - Lillian & Zoey
night 3     (W) - Nora & Candace
morning 4   (W) - Ashley & Polly

ASHLEY + POLLY, LOLA + ABIA (40%) (the bad one)
(Lillian & Zoey is replaced with the second Lailani pair, met in either order. If you need Lailani & Jessie on Evening 2, Lola & Nora will prevent it 50% of the time, I don't have a backup for it.)
afternoon 1     - Ashley & Polly
evening 1       - Lola & Abia
night 1         - Lailani & Sarah  OR Lailani & Jessie
morning 2   (W) - Lola & Abia (Airport = RIP)
afternoon 2     - Ashley & Lillian
evening 2       - Lailani & Jessie OR Lailani & Sarah
night 2     (W) - Ashley & Lillian (Surf Shack = RIP)
morning 3       - Jessie & Brooke
afternoon 3 (W) - Lailani & Sarah  OR Lailani & Jessie
evening 3       - Hub
night 3     (W) - Jessie & Brooke
morning 4   (W) - Ashley & Polly
afternoon 4 (W) - Lailani & Jessie OR Lailani & Sarah

ASHLEY + LILLIAN (37%) - 1 WING VERSION
(If you're at insane pace out of Date 1 with Lillian, it'd be smart to make it a 1 Wing attempt instead. You'll be lacking smoothies/gifts if you don't buy any day 1, but it's worth a shot. You'll need 2 of the 3 Morning sex options, and both Lailanis. I've tried to turn it into 3 different guaranteed paths, so you can just get on one path and follow it)
afternoon 1     - Ashley & Lillian
evening 1       - Hub
night 1     (W) - Ashley & Lillian (Airport = chance of RIP)
morning 2       - Lola & Nora      OR Lola & Abia      OR Lola & Abia
afternoon 2     - Lailani & Sarah  OR Lailani & Jessie OR Lailani & Sarah
evening 2       - Ashley & Polly   OR Ashley & Polly   OR Lola & Nora
night 2         - Lillian & Zoey
morning 3   (W) - Lola & Nora      OR Ashley & Polly   OR Lola & Nora
afternoon 3 (W) - Lailani & Sarah  OR Lailani & Jessie OR Lailani & Sarah
evening 3   (W) - Lillian & Zoey (Hotel/Boardwalk/Hotel = RIP)
night 3         - Lailani & Jessie OR Lailani & Sarah  OR Lailani & Jessie
morning 4   (W) - Ashley & Polly   OR Lola & Abia      OR Lola & Abia
afternoon 4 (W) - Lailani & Jessie OR Lailani & Sarah  OR Lailani & Jessie

I would encourage anyone to try to come up with routes on their own, though it can be very difficult to wrap your head around. The speedrun mod's cheat mode can help immensely with testing, with tutorial skip, instant relationship level-up, and telling you the percentage chance of given pairs to appear.

As far as shopping goes, I max out my smoothie usage for days 1, 2, and 3, and I try to buy affection plushies, affection candles (perfume), and affection flowers, slapping them on a relevant girl. I never talk or bother with food.