Leinster tore Gloucester's second string apart at the RDS to claim their second bonus-point victory in the space of a week.The four-time Heineken Champions Cup winners ran in nine unanswered tries against the underpowered visitors in a horribly one-sided contest that did further damage to the reputation of this competition.Ronan Kelleher helped himself to a first-half double with James Lowe, Josh van der Flier and James Ryan also crossing to give Leinster a 31-0 lead at the interval.Luke McGrath grabbed the first of three second-half scores, with Lowe registering his 50th Leinster try, while Johnny Sexton played 20 minutes on his return from injury as the hosts coasted to a 12th win in a row.Replacements Jordan Larmour and Dan Sheehan rounded off the scoring late on.James Lowe scores his 49th try for Leinster