Context: a boxer has a lot of female fans that worship him because of his handsomeness. They call him 王子. His trainer is a pervert who likes to receive anal sex from women with sex toys. In an extra scene at the end of the manga, the boxer and his trainer meet a female fan that hands him a lipstick and a paper sheet saying:
このメスブタめに〝お恵み〟を与えて頂けないでしょうか…
The boxer rubs the lipstick on his lips and kisses the paper sheet. Then he says:
欲しがりなブタは嫌いじゃあない
After this, the trainer takes the lipstick and asks:
このオスブタめの〝穴〟に恵みをくださ〜〜い♡ ミストレス
1) What is the meaning of メスブタ and オスブタ in this context? I know they are the female and male of the pig, but do they have a metaphorical meaning here?
2) What is the め after メスブタ and オスブタ?
3) What is the meaning of 欲しがりなブタ? How does ブタ as a suffix work?
4) Why is it じゃあない and not じゃない in the second sentence?
Here's the original page. Thank you for your help!
EDIT:
I found here this definition of メスブタ:
SMプレイ時に興奮度を高めるなどの目的で、サディスト側がマゾヒスト側へ投げかける言葉の一つ。
But still, why does she call herself メスブタ?