PLT IN ACFT X LANDED OVER ACFT Y AFTER RECEIVING GAR CLRNC. AFTER LNDG; PLT IN ACFT X GIVEN CLRNC TO TAXI OFF RWY. PLT PROCEEDED TO CROSS AN ACTIVE RWY.

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A POTENTIAL ACFT INCURSION OCCURRED AT CAPITAL CITY ARPT; HARRISBURG; PA. I WAS RETURNING TO CXY FROM THE PRACTICE AREA; IN A C152 APPROX 10 MI W OF THE AIRFIELD WHEN I ENTERED HARRISBURG AIRSPACE. AFTER RECEIVING MY XPONDER FREQ; I WAS DIRECTED TO DO A 360 DEG TURN. JUST UNDER 1/2 WAY THROUGH THE TURN. I WAS DIRECTED TO RETURN TO AN EASTERLY HDG AND WOULD BE LNDG SECOND IMMEDIATELY FOLLOWING WHAT I BELIEVE WAS A PIPER CUB. I CONTINUED TO THE AIRFIELD AND MADE A VISUAL WITH THE OTHER ACFT AS IT CROSSED APPROX 1/4 MI TO MY FRONT FROM R TO L ON BASE LEG INTO RWY 12. I WAS #2. I WATCHED THE PIPER CUB LAND AND AS I REACHED SHORT FINAL I HEARD 'CLR TOUCH-AND-GO RWY 12.' I REPEATED CLR TOUCH-AND-GO AND CONTINUED MY DSCNT. AFTER I HAD THE RWY MADE; AND WAS APPROX 15-20 FT OFF THE GND; I HEARD FOR THE FIRST TIME THE DIRECTION TO 'GO AROUND.' I DID NOT FEEL I COULD SAFELY EXECUTE THE GAR AT THAT POINT IN THE DSCNT AND IN MY JUDGEMENT THOUGHT IT WAS SAFER TO PUT THE PLANE ON THE GND. I RECALL SEEING THE PIPER CUB OFF TO MY 9 O'CLOCK POS AND KNEW I HAD CLRED THE ACFT. I PROCEEDED TO LAND THE PLANE. STILL THINKING I WAS CLR FOR THE OPTION; I CLOSED THE CARB HEAT; LIFTED THE FLAPS AND ACCELERATED FOR TKOF. THE TWR THEN DIRECTED ME TO TAXI TO TXWY H AND RETURN. I HAD TO BRAKE HARD TO MAKE THE TXWY; BUT WAS ABLE TO MAKE THE TURN. MY PAX HAD BEEN IN THE PLANE ABOUT 1 1/2 HRS AT THIS POINT AND TOLD ME THAT HE WAS READY TO WRAP IT UP FOR THE DAY. AS I REVIEWED THE EVENTS IN MY MIND; I REALIZE THAT I HAD EITHER LOST CONCENTRATION OR BECOME DISTR. I CONTINUED STRAIGHT ON TXWY H AND CROSSED THE HOLD SHORT FOR THE NEXT RWY -- RWY 8.