BOSTON -- Spencer Steer shows no signs of slowing down … and despite the calendar flipping to June, neither does his Mustache May.

Steer continued his strong season with a go-ahead two-run homer en route to a 5-4 Reds victory over the Red Sox on Wednesday night at Fenway Park to give Cincinnati its fifth straight win and just its second series win over Boston, with the first coming in the 1975 World Series.

Steer’s blast came with two outs in the seventh inning on a 2-2 pitch from Red Sox reliever Josh Winckowski, leaving the bat at 101.6 mph and traveling a Statcast-projected 382 feet into the front row of seats atop the Green Monster.

“Yeah, that one was pretty sweet, that one felt good,” Steer said. “Don’t usually show a lot of emotion when I play, but I couldn’t help it in a spot like that. So that was awesome for not just me but the entire team. Can’t beat it at Fenway.”

At 25 years old and just 80 games into his Major League career, Steer is already showing the Reds just how valuable he can be.

After starting the season with 19 games at third base, Steer slid across the diamond as the Reds’ everyday first baseman by the end of April. Despite the comfortable fit at first, Steer has offered to learn to play other positions if needed, a proactive step that hasn’t gone unnoticed.

“It’s just kind of who he is,” manager David Bell said. “None of us take it for granted. It says a lot about Spencer, and he’s just continued to be a steady presence in the middle of our lineup. He’s played solid defensively, and he can hit too. Right from the very first pitch tonight, he was locked in.”

“It means a lot,” Steer said. “Just means that they believe in me, they trust me. And as a player, that goes a long way, that the manager and the coaching staff really believes in what you’re doing. So continue to try and go about it the right way and keep trying to help this team win games.”

Though Steer’s first at-bat of the night resulted in a flyout to left, he worked a full count against veteran lefty James Paxton, who needed nine pitches to get Steer out. Then came the seventh, when Steer capitalized with a runner in scoring position and two outs to record his team-leading eighth home run and 10th go-ahead RBI.

The Reds entered Wednesday batting .255 with a .741 OPS with two outs. Their 105 RBIs with two outs (43.4 percent of their total RBIs) were tied with the Red Sox for seventh in the Majors. On Wednesday, Cincinnati recorded all four of its RBIs with two outs.

“It’s all about the at-bats and competing,” Bell said of the Reds’ success with two outs. “You’re not always going to get hits in those situations, it’s nice when you do and obviously leads to a lot of runs. But when you don’t, looking for that opportunity next time is really important. Because a lot of the hits with runners in scoring position is a big confidence thing, you have to want to be up in that spot.”

It’s a confidence that Steer and the Reds seem to possess. Luke Maile drove in Cincinnati’s first run of the game with an RBI double with two outs in the fifth. Nick Senzel added another run with his two-out, sixth-inning RBI single, and Will Benson scored on a double play to tie the game in the seventh ahead of Steer's decisive two-out blast.

“I wouldn’t say [my approach] changes, I think this team is just so resilient,” Steer said. “I think we just battle until the last out … that’s what we work for, right? That’s what we’re getting here early and hitting in the cages for, is to come through in those big moments, and I think we’ve just done a great job of not letting those moments get too big. And just sticking with our approaches and what’s worked leading up to this point.”

The Reds closed the book on May with a 14-13 record over the month. As for Steer’s mustache?

“It’s gonna stay,” Steer said. “It’s gonna stay for a little longer.”