Like the girls have said it just happens and you will be amazed at what you can do when you are b/f #2. DD decided to TT when DS was born so poor DS was dragged to the potty so many times during feeds (DD's way to get my attention too). I used to get a big bowl of fruit ready in the morning for DD and then would get that out for her and a drink of water before I would start a feed, I would pop in the night garden on the telly, she also liked me to read her books which I really enjoyed as she would sit between my legs and read to me and DS. Another one of her favourites was to "help" me feed. She would tell DS it was time for a feed, lift up my shirt, undo my bra and shove his head at my breast telling him "mulk time". It really did only take a few weeks and she would start to entertain herself during feeds. DS was and still is a super quick feeder so I didn't need to entertain her for long.
As for relaxing during a b/f I loved the overnight feeds when it was just me and DS up so we would snuggle under a blanket together and have a beautiful feed and that special time. I love my night feeds. I actually think maz started a whole thread about them.
Good luck when #2 arrives.