This world completely sucks from a modern perspective, and I have no idea how she could survive. Her only effective weapon is a stun gun that must be turned onto max setting to even get a result, and she is extremely weak. The ML is good to her for his species but that is not saying much since they normally keep the women in shitty conditions and continuously r*pe them... there is a certain amount of cultural difference I can overlook, but basically the women are treated like crap, and yet described as powerful and independent. There’s some lack of logic here because women are a scarce asset in this world, so maybe they should be treated better...

Why was Ryan small to begin with? How did it get fixed? What happened to Pat after she returned?

The ML trapped MC in a cave for days on end when she finally returns to that world and the ML didn't let her see sunlight until he was sure she wouldn't disappear, run away, or something to that effect. All the while having some consensual and and later one very dubcon s*x basically non stop.

the author forced a 'happy ending' where the FL returned to that dangerous world just because she suddenly realized during their separation that she loved him. This is despite them not matching in terms of personality or worldview when they were together. And poor parents who had to die early so that the FL would have no choice but to settle to that world because she had no ties left to her real world.

What I liked about the middle section:

The stoic ML surprisingly demonstrates his sense of humor and attempts to adopt her ideals (like ending the practice of sharing females and courting the other instead).

What I disliked: The influx of boring characters like Suzanne made the 2nd part so bland. Sure, Suzanne is important because she is the only female character the MC gets to have close interactions with, but her conservative personality makes their interactions so boring to read through. Boring characters makes a story boring.

What I liked about the third section:

It was nice to see the MC finally resolving the relationship issues from the middle part by letting Ryan accompany her in her visits to her own world.

Eric is outgoing and brave, in contrast with the shy and reclusive nature of deers. He is the MC's only true friend and the most honest and straightforward characters she meets

Leopards are solitary creatures, yet Ryan yearns for love and companionship so much that he gets extremely possessive (aka yandere).

1) The two of them had already spent a prolonged amount of time together which gave the ML time to slowly understand her

2) The two of them established strong communications and resolved much of their differences by making compromises. The ML tried to learn how to court her (even though the concept didn't exist in his world). He followed her demands to maintain good hygiene even though he had no concept of bacteria. (However, they did fail when it came to the topic of the MC returning home)

Offense: Ryan lied to her about Pat's death to destroy her goal of returning home

Although lying was the wrong thing to do, the ML was already breaking the norms by seeking and caring about her consent. The concept of consent doesn't exist in his world. Females were treated like commodities and expected to comply with the demands of their protectors/captors.

It's an emotional insecurity. He feared that the MC would disappear forever once she's returned to her world. His fear only skyrocketed when the MC wouldn't give a straightforward answer him after he inquired her about this.

The MC could've told him that she's not sure of her feelings for him and isn't ready to make a decision about staying permanently.

The compromise she could've made is that she could visit occasionally (Ironically this is what they ended up doing once the MC earned back his trust, except it was reversed with the MC making occasional visits to her parents (similar to Inuyasha)

Something I didn't like is why ML is determined on making her abandone her family and whole world but he isn't ready to leave his tribe and life. I mean if you can't bear to live without her then go with her instead of trapping her in his world. After all he is the one who fell in love first.

Is there any need for her University degree ? She didn't even study the connection between the two world's (not mentioned). She also didn't try rising livestock (or just bringing animals to the forest and they reproduce and live on there own) that don't turn into humans. She didn't need to eat beastmen like ML to 'accept his lifestyle ' when she has other solutions. The ecosystem will be affected anyway after all herbivores learned farming and no longer depend on forest for living.