Daddy isnt home but his motorcycle is in the garage, me and sister arent supposed to touch it! But we cant help ourselves, we explore the bike and both hop on, we straddle the seats and it makes us feel so horny feeling the big engine between our legs in our skirts. We start grinding and humping the bike while pulling off eachothers clothes and kissing, we notice that there are keys in the engine! We turn on the bike and revv the engine, it roars between our thighs and excites us. We start humping the bike some more and cumming while revving the engine.