Am i being seduced?

my sisters boyfriend is really cool with me. yesterday i went to his house and he took me to the garage and told me hey watch this video, and we watched it. like right in the middle of the video he started to breathe hard and swallow hard and i could feel his body heat.he was kinda scooting towards me. he also kinda looks at me when my sis and him are kissing does this mean anything?