Person 1「ふむ……魅力的な提案だが、今はよしておこう。こちらも色々と仕事があるのでね」

Person 2「今は……ね。ああ、でも貴方に手を付けちゃうとガーネットに怒られそう。姫様にも色々言われそうだわ。 私よりもよっぽど面倒そうじゃない」

Person 1「 **本人には自覚は全くないんだがな** ―― まあ、その様子なら大丈夫だとは思うが、面倒事が起こる前に用事を済ませて帰れよ？」

I was under the impression that 本人 is third person, and if he was referring to
ガーネット or 姫様 then he would have used 本人たち instead. In this case then I think it
would refer to the person he is talking to, but I don't quite understand. Does
anyone care to clarify who he is referring to?

Edit: Context:

Person 2 jokingly "invited" Person 1 to sleep with them.

1) Why would ガーネット get angry if Person 2 slept with Person 1?

Person 1 is an Incubus who in the past has deceived ガーネット and slept with her,
she would naturally get angry if her friend sleeps with the same man she
detests.

1) Why would 姫様 get angry if Person 2 slept with Person 1?

Person 1 is also technically her future husband.
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meaning
Who is 本人 referring to in 本人には自覚は全くないんだがな
I think, 本人 refers to the person he is speaking to, since he said
「...私よりもよっぽど面倒そうじゃない」 Then, indicated by 「... **その** 様子なら大丈夫だとは思うが...」 and
imperatively asking him to clear things up and go home.「... 面倒事が起こる前に用事を済ませて
**帰れ** よ？」
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Most of the time, 本人 refers to a third person. But there are some cases where
it refers to the speaker himself/herself in a third-person way.

  * 「俺はよく面倒そうなやつだと言われるんだ。 **本人** には自覚が全くないんだけどね」  
_People often call me a troublesome guy. But the person himself (= me) doesn't
see himself that way at all._

  * 「 **本人** は気にしてませんので、そんなに謝っていただかなくても結構です」  
_The person herself (= me) wasn't offended, so you don't have to apologize so
profusely._

  * 「医者には自宅で休むようにと言われましたが、 **本人** はいたって元気です」  
_The doctor told me to rest at home, but the person herself (= me) is feeling
quite fine._

I have no idea what your conversation is about, but you should consider the
possibility that 本人 refers to Person 1 himself.
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Based on the additional context provided I believe that 本人 refers to 姫様.

The statement 私よりもよっぽど面倒そうじゃない to me says that rather than "Person 1" or
"Person 2" being more or less of a bother, it's referring to what they will
have to face as a consequence if they sleep together(Person 2 would likely get
an earful from ガーネット and Person 1 an earful from 姫様, and Person 2 thinks that
dealing with 姫様 is going to be more troublesome than ガーネット)
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