Sorry for the wait! Here's a guide to getting all 6 endings and unlocking all the CGs!

Note: Nix's route is entirely controlled by his 'desperation points', the more you reject him, the more desperate he gets.

Step 1, getting into the routes. (this happens when MC falls asleep and has a dream):

For Rudy:

• "He sounds a little rough around the edges. I feel like I know him"
• "He looks pretty grumpy for someone in such a frilly apron, although the way his cheeks reddened is pretty cute."
• "He held out a lunch box towards me and quietly pointed at the table where breakfast had already been made. "

For Nix:

• "Whoever it is, he’s friendly and chipper. He seems very familiar to me"
•  "He seems pretty happy in the maid outfit, he keeps twirling around like there’s no shame in it."
• "He happily stood aside and made a gesture towards the floor and walls. It seemed like he cleaned it before I woke up."

Step 2, the endings!

Once you get in his route, you essentially reject him at every turn, when he has 10 desperation points, the ending should trigger.

• Say you have a spare mattress when he asks to sleep with you (+1)
• Ask "why?' when he shows off the maid outfit (+1)
• "I think this is enough petting, no?" (+1)
• Think "(Unfortunately, that’s not my thing)" when he gives you breakfast (+1)
• Run and pretend that you never saw him on campus (+1)
• Tell him to stay in his own place when he asks to cuddle (+1)
• Tell him to "Just go already" when he asks for a goodbye hug (+2)
• Say that he's not your boyfriend in front of Rudy (+2)

ED2 (Rudy)

• Enter Rudy's Route
• When his friends ask what kind of guy you like, say you want someone "Someone cute and sweet. Always there to help me out."
• (I swear that this is still a happy ending for Rudy!)

ED3 (Rudy)

• Enter Rudy's Route
• When his friends ask what kind of guy you like, respond with "Men that can cook, It’d be great if they have a ponytail! Maybe their name starts with an ‘R’?"

ED4 (Nix):

• Enter Nix's Route
• Don't fully reject him, at least be friendly with him. (Make sure his desperation points are below 10)
• When he confesses, respond with "Okay stop that, give me some time." (+3)
• If his desperation points are 5 or above, the ending should trigger.

ED5(Nix):

• Similar to ending 4, but make sure Nix's desperation points are below 2 since telling him "Okay stop that, give me some time." will add 3 points.
• If his desperation points are 4 or below, this ending should trigger.

ED6 (Nix)

• Enter Nix's Route
• Choose whatever but make sure you don't reject him all the time as that will cause ED1 to happen instead.
• Accept his confession. (This will lower his desperation points to 0)